93 jeep grand cherokee, cruise control
first, there is no 'fuse' identified in either of the Haynes or Chilton's manuals. I've looked. There could be a 'fuse link' somewhere in the line, as it's incomprehensible the folks at Chrysler would design this vehicle with a fire hazard built into it like that, no fuse or fuse link or relay known, but the mythological 'fuse' referenced in the troubleshooting section of both manuals.
In any case, if the vacuum line appears to not leak when you open it and **** on the line going to the rest of the vacuum system, or pull vacuum on it with a small handheld vacuum pump, and it doesn't leak, it then becomes an 'electrical' issue.
mine worked flawlessly for a a long time, and suddenly without warning 'died' and wouldn't work one day. It didn't go out on the job, in other words.
last but not least, references to the brake switch are made, but if the brake lights work, that seems to eliminate the brake switch as a possibility.
sounds expensive taking it to a Jeep dealership, but if you have a reputable one (hahahahahahah!) in your vicinity, they might zero in on it fast and fix it cheap, then again, they may not. Driving this vehicle without cruise control across country isn't so bad, but it requires a lot of foot wedging near the pedal, to get that done without having a very tired leg over time.